Extra skyboxesExtract the hak from one of these archived files and put it into your hak folder. It should overwrite the similar named, but much smaller, file that came with the main hak pack.
http://www.amiaworld.net/hak/amia_v3_skyboxes.7z (26 MB)
http://www.amiaworld.net/hak/amia_v3_skyboxes.zip (36 MB)
Extra musicExtract the hak from one of these archived files and put it into your hak folder. It should overwrite the similar named, but much smaller, file that came with the main hak pack.
Put the .bmu files in the /music/ folder of your nwn installation.
http://www.amiaworld.net/hak/amia_v3_music.7z (136 MB)
http://www.amiaworld.net/hak/amia_v3_music.zip (136 MB)
You can play perfectly well without these two downloads. You'll see standard skyboxes and hear standard music instead. If you don't listen to the music in NWN I'd not bother downloading the music pack.